Latest Collection of Seomoz FRE SEO Tools,The SEO ToolBox is a collection of FREE SEO tools. I highly recommend you check out its full list of advanced SEO tools.
Strongest Pages on a Domain
Determines what the strongest pages are on your domain.
Reports the number of backlinks to a URL, also shows a historical view of previous backlinks.
Reports the PageRank of a URL and shows a historical view of previous PR scores.
Find Domain Age
Find the age of your domain and when it was first spidered by the search engines.
Check HTTP Status Code
301 302 Find out what HTTP status code a website is producing.
Check Indexed Pages
This SEO Tool looks at the three major search engines and reports back how many pages you appear to have indexed.
Find out a domain’s registration information.
This is not an SEO tool, but is very useful in determining the geographic location of an IP address using a bit of AJAX and Google Maps.